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SPATIAL DISPERSION AND SEQUENTIAL SAMPLING OF THE POTATO APHID, MACROSIPHUM EUPHORBIAE (HOMOPTERA: APHIDIDAE), ON PROCESSING-TOMATOES IN OHIO1

Published online by Cambridge University Press:  31 May 2012

Gregory P. Walker ,
Laurence V. Madden  and
Donald E. Simonet
Gregory P. Walker
Affiliation:
Department of Entomology, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio 44691
Laurence V. Madden
Affiliation:
Department of Entomology, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio 44691
Donald E. Simonet
Affiliation:
Department of Entomology, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio 44691
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Abstract

Spatial dispersion of potato aphids was studied in fields of processing-tomatoes for 2 years to develop a sequential sampling scheme for the aphid. Potato aphids were found on upper, middle, and lower leaf strata in the percentages 60, 31, and 8. Dispersion was clumped, apterates more so than alates. Among-plant variance was generally greater than within-plant variance. There was a good linear relationship between mean crowding and the population mean and an excellent linear fit between log variance and log mean on all leaf strata for green and pink forms of the aphid and for alates and apterates. The log variance – log mean relationship was used as a basis for sequential sampling.

Résumé

La distribution spatiale du puceron de la pomme de terre a été étudiée dans des champs de tomates destinées à la confection d'aliments préparés pendant 2 ans afin d'élaborer un plan d'échantillonnage séquentiel. Les pourcentages de pucerons collectionnés dans les strates supérieure, médiane et inférieure étaient de 60, 31 et 8%. La distribution était agrégée, celle des aptères plus que celle des ailés. La variance inter-plants était généralement plus grande que la variance intra-plant. On a observé une relation linéaire entre le groupement moyen et la population moyenne, de même qu'une relation linéaire très bien ajustée entre le log de la variance et le log de la moyenne sur toutes les strates, pour les biotypes vert et rose ainsi que pour les ailés et les aptères du puceron. La relation log variance/log moyenne a été choisie pour établir l'échantillonnage séquentiel.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 8 , August 1984 , pp. 1069 - 1075
Copyright
Copyright © Entomological Society of Canada 1984

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